Calculation method of main cable alignment of long-span suspension pipeline bridge

A calculation method, pipeline bridge technology, applied in the direction of instrumentation, geometric CAD, electrical digital data processing, etc., can solve the problems of iteration non-convergence, error, etc., and achieve the goals of reducing the number of iterations, improving estimation accuracy, and improving convergence and adaptability Effect

Active Publication Date: 2022-04-15
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

[0004] At present, engineering designers mainly use the plane parabola theory to estimate the three-dimensional force at the beginning of the main cable as the initial value of the iteration. For the space main cable, this method has a large error, which may cause subsequent iterations to fail to converge

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  • Calculation method of main cable alignment of long-span suspension pipeline bridge
  • Calculation method of main cable alignment of long-span suspension pipeline bridge
  • Calculation method of main cable alignment of long-span suspension pipeline bridge

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[0070] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0071] The present invention makes the following assumptions to the main cable cable system of the space cable-shaped suspension bridge:

[0072] (1) The main cable and the sling are small-strain ideal flexible cables, and their materials satisfy Hooke's law, and the Poisson effect is ignored.

[0073] (2) The sling only inclines along the direction of the transverse bridge when the bridge is completed, and the inclination error of the sling in the direction of the longitudinal bridge during the construction process is ignored.

[0074] A method for calculating the main cable alignment of a long-s...

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Abstract

The invention relates to a method for calculating the main cable alignment of a long-span suspension pipeline bridge, which belongs to the field of spanning design of oil and gas pipelines. The corrected three-way component force at the beginning of the main cable is obtained; taking the three-way component force at the beginning end of the main cable and the design control point as the initial value of the iteration, the line shape of the main cable and the stress-free length of each cable section are calculated by using the space-segmented catenary theory; The modified influence matrix method is used to obtain the iterative variable increment, and iterated repeatedly to correct the three-dimensional force at the beginning of the main cable, and recalculate the main cable alignment and the stress-free length of each cable segment. The invention solves the previous problems of imprecise design, too many assumptions, and large calculation errors. The design and calculation of the method can greatly improve the calculation accuracy of the main cable alignment and stress-free length of the suspension pipeline bridge.

Description

technical field [0001] The invention relates to a method for calculating the line shape of main cables of a long-span suspension pipeline bridge, which belongs to the field of spanning design of oil and gas pipelines. Background technique [0002] Pipeline suspension bridges are generally composed of main cables, suspension cables, wind cables, wind stay cables, stabilizing cables (conjugate cables), stiffening beams, cable towers and anchorages. Since its main purpose is to transport oil, natural gas or water, supports are usually set up on the bridge deck for erecting pipelines, and a simple maintenance path is set up to facilitate the construction and subsequent maintenance of pipelines. Pipeline suspension bridges have a small width-span ratio, low structural rigidity, and are sensitive to wind resistance. Generally, wind cable systems need to be installed. The mechanical characteristics of the pipeline suspension bridge are: the load acting on the bridge deck and the v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/14
Inventor 左雷彬胡川川杨威詹胜文刘思萌陈晓晖李国辉
Owner BC P INC CHINA NAT PETROLEUM CORP
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